Finally, it's hard to make an AGI if the rest of humanity thinks you're a supervillain, and anyone making an AGI based on a value system other than CEV most certainly is, so you're better off being the sort of researcher who would incorporate all humanity's values than the sort of researcher who wouldn't.
If you're openly making a fooming AGI, and if people think you have a realistic chance of success and treat you seriously, then I'm very sure that all major world governments, armies, etc. (including your own) as well as many corporations and individuals will treat you as a supervillain - and it won't matter in the least what your goals might be, CEV or no.
Taken from some old comments of mine that never did get a satisfactory answer.
1) One of the justifications for CEV was that extrapolating from an American in the 21st century and from Archimedes of Syracuse should give similar results. This seems to assume that change in human values over time is mostly "progress" rather than drift. Do we have any evidence for that, except saying that our modern values are "good" according to themselves, so whatever historical process led to them must have been "progress"?
2) How can anyone sincerely want to build an AI that fulfills anything except their own current, personal volition? If Eliezer wants the the AI to look at humanity and infer its best wishes for the future, why can't he task it with looking at himself and inferring his best idea to fulfill humanity's wishes? Why must this particular thing be spelled out in a document like CEV and not left to the mysterious magic of "intelligence", and what other such things are there?